diff --git a/workers/request_ssl_auth_worker.rb b/workers/request_ssl_auth_worker.rb
index 86ba90dc..a5cf2b9f 100644
--- a/workers/request_ssl_auth_worker.rb
+++ b/workers/request_ssl_auth_worker.rb
@@ -8,6 +8,7 @@ class RequestSSLAuthWorker
 
   def perform(site_id)
     site = Site[site_id]
+    return if site.domain.blank?
     challenge = site.request_ssl_authorization
 
     CreateSSLCertWorker.perform_in 5.seconds, site_id, challenge.to_h.to_json